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Proceedings Paper

Circular component measurements and particle shape determination: a Monte Carlo simulation study
Author(s): Yongxiang Hu
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Paper Abstract

Monitoring aviation safety hazards, such as icing conditions, and retrieving cloud physical properties for climate modeling studies requires cloud thermodynamic phase (water/ice) discrimination. Polarization information from lidar measurement provide such information. Depolarization of lidar backscattering indicates that the scattering cloud particles are non-spherical (i.e., ice clouds). For space based lidar measurements, backscatter from water cloud particles is also depolarized because of multiple scattering. Thus cloud water/ice discrimination is not straight-forward. An alternative method which is less sensitive to multiple scattering is proposed in this study. The new approach is based on the fact that there are big differences in P44 (an element of the scattering phase matrix) at 180° between spherical and non-spherical particles. When the incident beam is left-hand-circularly polarized, backscattering by a nonspherical particle is also left handed. Circular component of backscattering by a spherical particle is right-handed for left-hand-circularly polarized incident beam. Monte Carlo simulations with full Stokes vector indicate that multiple scattering does not affect the sphere/non-sphere determination with this new circular polarization approach.

Paper Details

Date Published: 12 January 2004
PDF: 10 pages
Proc. SPIE 5240, Laser Radar Technology for Remote Sensing, (12 January 2004); doi: 10.1117/12.510268
Show Author Affiliations
Yongxiang Hu, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 5240:
Laser Radar Technology for Remote Sensing
Christian Werner, Editor(s)

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